Buy I Bonds Before November 1, 2026? What the Rate Reset Means for US Savers

Updated October 8, 2026. Educational content for US savers, not investment, tax, or legal advice. Series I savings bond rates, purchase limits, and tax rules come from the U.S. Department of the Treasury / TreasuryDirect and can change; always confirm current details at TreasuryDirect.gov before you buy.

Every six months, on May 1 and November 1, the Treasury resets the rates on Series I savings bonds. The next reset is November 1, 2026, which means the current offer window closes after October 31.

If you are still deciding whether to use part of this year's I bond purchase limit, the clock is real. Buying by October 31 locks today's fixed rate for as long as you hold the bond. Waiting for November means you accept whatever new fixed rate the Treasury announces, which could be higher, lower, or the same. This guide explains what resets, what stays locked, how the current 4.26% composite rate works, and a simple framework for deciding whether to buy now or wait.

What an I bond actually is

A Series I savings bond is a U.S. government savings bond sold through TreasuryDirect. As of January 1, 2025, new I bonds are sold electronically only in a TreasuryDirect account. Key rules for US buyers:

• Purchase limit: up to $10,000 in electronic I bonds per Social Security number (or EIN) per calendar year, plus separate room for Series EE bonds
• Minimum purchase: $25, or any amount above that to the penny
• Interest life: up to 30 years
• Earliest cash-out: after 12 months
• Early-redemption penalty: if you cash in before 5 years, you lose the last 3 months of interest
• Taxes: interest is subject to federal income tax but exempt from state and local income tax; you can defer federal reporting until you redeem or the bond matures

I bonds are not FDIC-insured bank deposits. They are a direct obligation of the U.S. Treasury, which is why many savers treat them as a separate inflation-linked sleeve next to a high-yield savings account or CDs.

How the rate is built: fixed + inflation

Every I bond earns a composite (combined) rate made from two parts:

1. Fixed rate — set when you buy, and it never changes for that bond
2. Inflation rate — reset every May 1 and November 1 for all I bonds, based on CPI-U

For bonds issued from May 1, 2026 through October 31, 2026, TreasuryDirect currently shows:

• Composite rate: 4.26% (annualized rate that applies for the first six months after issue)
• Fixed rate: 0.90%

The fixed rate is the piece that survives every future inflation reset. The inflation piece will move again on November 1 for every outstanding I bond, including ones you already own. That is why "buy before November" is mostly a decision about locking today's fixed rate, not about freezing the entire 4.26% forever.

What changes on November 1, 2026

On November 1, the Treasury announces:

• A new fixed rate that applies to I bonds issued from November 1, 2026 through April 30, 2027
• A new semiannual inflation rate that feeds into the composite rate for all existing I bonds (each bond applies the new inflation component on its own six-month anniversary)

Nobody outside the Treasury knows the November numbers until they are published. Higher measured inflation usually lifts the inflation component. The fixed rate is a policy choice and has moved both up and down in recent resets. In May 2026 it was set at 0.90%, the same fixed rate used for the prior November 2025 window.

Practical takeaway: if you buy by October 31, you keep the current 0.90% fixed rate for up to 30 years. If you wait, you get the November fixed rate instead. The inflation component will keep changing either way.

Why October purchases still earn from October 1

I bonds earn interest from the first day of the month you buy them. An electronic purchase on October 8, 15, or 31 all start earning for October. Your personal rate-change months then follow the issue month. For an October issue, rates typically reset each April 1 and October 1.

That quirk matters near a reset: buying late in October still gets you a full month of the current composite window's starting rate schedule, and it still locks the current fixed rate.

I bonds vs a high-yield savings account right now

Many US savers are comparing I bonds with online high-yield savings accounts after the Federal Reserve's recent rate move. They are different tools:

	Series I bond	High-yield savings (typical online bank)
Liquidity	Locked at least 12 months; 3-month interest penalty if cashed before 5 years	Usually same-day or next-day access
Rate path	Fixed piece locked; inflation piece resets twice a year	Bank can change APY anytime
State tax	Interest exempt from state/local income tax	Usually fully taxable at state level
Annual cap	$10,000 electronic per SSN per year	No Treasury-style purchase cap
Best use	Money you can leave alone 1–5+ years and want inflation linkage	Emergency fund and near-term cash

If the cash might be needed within a year, an I bond is the wrong parking spot. If it is "sleep money" you will not touch until at least next fall, the state-tax exemption and inflation link can matter more than chasing the highest temporary bank APY.

A simple decide-by-October-31 checklist

1. Do you still have 2026 purchase room? If you already bought $10,000 of electronic I bonds this calendar year under your SSN, you are done until January.
2. Is this money already earmarked for an emergency fund? Keep 3–6 months of expenses in a liquid savings or money market account first.
3. Can you leave the money alone for at least 12 months? If not, skip I bonds for now.
4. Do you care more about locking today's 0.90% fixed rate or about waiting to see November's fixed rate? Nobody can promise November will be better. Buying now removes that uncertainty for the fixed leg.
5. Are you comparing after state taxes? In high-tax states, the state exemption on I bond interest can narrow the gap versus a higher taxable HYSA APY.

How to buy before the window closes

1. Open or sign in to your account at TreasuryDirect.gov
2. Choose BuyDirect, then Series I
3. Enter the amount (from $25 up to your remaining annual limit)
4. Link a U.S. bank account for the purchase
5. Confirm the order so it is issued with an October 2026 issue date (purchases through October 31)

Gifts and linked child accounts have extra registration rules. If you hope to use savings-bond interest for qualified higher education expenses under the education tax exclusion, keep the bond in the parent's name, not the child's, and read the IRS rules carefully.

Common mistakes near the rate reset

• Thinking 4.26% is locked for 30 years. Only the 0.90% fixed rate is locked. The composite rate will change.
• Buying with money you may need in six months. The one-year lockup is a hard rule.
• Ignoring the calendar-year cap. A November purchase still counts against your 2026 $10,000 electronic limit.
• Forgetting EE bonds are a separate limit. You can also buy up to $10,000 in electronic Series EE bonds in the same year; EE bonds currently advertise a different fixed rate and different rules.
• Waiting for a "perfect" forecast. Markets and inflation prints will not give you the November fixed rate early. The decision is risk preference, not a secret spreadsheet.

Bottom line

For US savers who still have 2026 I bond room and can leave money untouched for at least a year, the October 31 deadline is mainly about locking the current 0.90% fixed rate before the November 1 announcement. The current composite rate for new bonds in this window is 4.26%, but that full rate is not permanent. If you need liquidity, fund emergencies first in a bank account. If you want inflation-linked, state-tax-advantaged savings with a known fixed floor, finishing a purchase before October 31 is the clean way to take today's fixed rate off the table.

Sources: TreasuryDirect I bonds overview, I bonds interest rates, and Buying savings bonds. Rates and rules checked against Treasury pages as of October 8, 2026.